Need a quick answer?
Most uploads finish in under a minute. If you’re blocked, message us through the in-app support widget or email support@support.fastsrt.com.
Live support
Mon–Fri · 9am–6pm UTC+8
Response time
We typically respond within 1 business day. Actual response times may vary depending on the volume of requests.
Getting started
Everything you need to spin up your first captioning task in minutes.
- How do tokens work?
- 1 token ≈ 1 second of processed media. Every new account receives 600 free tokens. Purchase additional token packs anytime and they never expire.
- What kind of files can I upload?
- Audio: MP3, WAV, AAC, FLAC. Video: MP4, MOV, MKV, and more. We automatically extract audio tracks for processing.
- What is the maximum upload file size?
- The current maximum upload file size is 1000MB (1GB). Future plans may include support for larger files.
- Is there a limit on concurrent jobs?
- Yes, up to 5 open tasks per workspace. Close or delete a finished job to free a slot instantly.
Workflow & accuracy
How we deliver high-quality subtitles you can trust.
- How accurate is Fast SRT?
- We run ensemble Automatic Speech Recognition (ASR) models to reach 95%+ accuracy on clean audio. You can fine-tune timings and texts in the built-in editor.
- Does it support multiple speakers or languages?
- Yes. We support the majority of the most widely used languages, say, English, Chinese, Spanish, etc. You can edit speaker labels afterward.
- How does language auto-detection work?
- Language auto-detection and the set of supported languages depend on the Whisper AI model version we run. Per-language accuracy can vary — some languages are better supported than others. For more details please refer directly to OpenAI's Whisper documentation.
- Can I edit and export in different formats?
- Absolutely. Use the timeline editor to tweak text, then export SRT or VTT with one click.
Billing & security
Transparent pricing and enterprise-grade safeguards.
- Do I need a subscription?
- No subscriptions required. Pay-as-you-go with tokens or contact sales for committed enterprise plans.
- How do you store my media?
- Files are encrypted at rest in R2, retained only while tasks are active, and can be deleted at any time from the dashboard.